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Atomtronics-Photonics risks and mitigation strategies

juliobarreiro
# Risk Mitigation
1 Low Q of ring-resonators in vacuum 1) Use more power; 2) Post-fab annealing; 3) Process improvement.
2 Sample heating (by laser) and temperature instability Use cooled and temperature regulated sample stage. Reduce laser power fluctuations with feedback.
3 Insufficient circulating trap power PIC annealing. SLM/DMD-based incoupling enhancement. Slave lasers.
4 Weak absorption signal Add intercombination cooling. Apply AC noise rejection techniques.
5 Insufficient number of trapped atoms Increase load time. SWAP cooling in red MOT. Narrower 689 beams. Geometrically brightened SrO source. Additional free-space transparency beam.
6 Weak fluorescence signal EMCCD detection. MOT re-capture. High-NA optics.
7 Imbalanced splitting Tune Bragg pulse parameters.
8 Low-contrast interference Stabilize trap intensity. Use full integer cycles. Smaller loops with more cycles.
9 PIC degradation over time Repeated device annealing at high temperature ($>$1500C) to suppress defects and drifting mechanisms
10 PIC drift due to atomic adsorption Substrate heating. Light-induced desorption.
11 Interaction of trapped atoms with adsorbates Annealing. Substrate heating. Light-induced desorption.
12 Insufficient brightness of SrO atom source Vary desorption power and wavelength. Vary SrO geometry and distance.
13 Atom loss from ring inhomogeneities Vary relative trapping beam power. PIC annealing. Feed back to fabrication steps.
15 Ring potential inhomogeneity at waveguide coupler Use modeling and observations as feedback to fabrication.
16 Back-scattering breaking CW/CCW symmetry, trap modulation due to partial standing waves Reduce considered 200~$\mu$K trap depths to 10-$\mu$K, tune trapping wavelengths.